Free email copy tool
Test your NPI provider outreach subject lines
Compare two drafts for clarity, compact inbox previews, and unresolved personalization tokens—without a made-up spam score or open-rate promise.
Browser-only editor
Compare two honest, useful openings
Review clarity, compact previews, and unresolved personalization tokens before you send. Your drafts stay in this browser.
Variant A
Subject line and preview
42 characters
55 characters
Your name <you@yourdomain.com>
{{first_name}}, a simpler way to [ben…
A quick idea for helping your providers with [outcome].
Compact editing preview only; inbox displays vary by device and provider.
Compact length
The subject is within a compact editing range. Inbox displays still vary by device and recipient settings.
Personalization token detected
Confirm “{{first_name}}” resolves for every recipient before you schedule the campaign.
Variant B
Subject line and preview
46 characters
46 characters
Your name <you@yourdomain.com>
A resource for your [practice or orga…
Here is the practical detail behind [benefit].
Compact editing preview only; inbox displays vary by device and provider.
Compact length
The subject is within a compact editing range. Inbox displays still vary by device and recipient settings.
A review tool—not a spam or open-rate score
A clear subject line cannot guarantee delivery, opens, replies, or legal compliance. Make sure it accurately represents the message and your sender identity.
Preview before you send
See an intentionally compact inbox-style preview, then decide whether the clearest point appears early enough.
Spot unresolved fields
Get a clear reminder when familiar personalization-token formats are still visible in the draft.
Keep it aligned
Use the checker to make sure urgency, claims, and preview text match the email you actually intend to send.
FAQ
Use it as a final editing pass
Does this subject line tester predict open rates?
No. It provides editing prompts based on your draft's length, compact preview, punctuation, promotional wording, and personalization tokens. It does not predict delivery, inbox placement, opens, or replies.
Does the tool send or save my drafts?
No. The comparison runs in your browser and does not send, save, or submit subject lines or preview text to NPI Data Hub.
Why should I check personalization tokens?
A visible placeholder can make a campaign feel careless or confusing. Confirm every token resolves using your sending platform before you schedule an outreach list.